Computing device



N. M. PURVlANCE. coMPuUNG'DEvIcE. APPLICATION FILED MAR. I0. 1921-A 1,426,332, i 'Patenten .151922.

N. M. PURVIANCE. COMPUTING DEVICE'.y APPuc/mpu mso mn. 10,. 192|.

Patented Aug. 15, 1922.

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NATHAN M. PURVIANCE, 0F LWISTON, IDAHO.

Specification of Letters Patent.

`osoiiriu'rnie DEVICE. E

Patented Aug. 15, 1922.

Application ledMarch 10, 1921.` Serial No. I51,235.

T 0 all whom t may concern Be it known thatl, NATHAN M. PURVI- ANCE, a citizen of theUnited States, and a resident of the cit i of Lewiston, county of Nez Perce, and tate of Idaho, have invented certain new anduseful Improvements /in Computing Devices, of which the followin is a specification.

y invention relates to new and useful improvements in computing devices, and has for its particular object the provision of a device for use by Opticians ywith whichy the transposition of vlenses used in spectacles ma be easily and'speedily determined. p

ther objects will appear hereinafter. The invention consists in the combinations `and arrangements of parts hereinafter described and claimed.

The inventionwill be best understood by reference lto the 'accompanying drawings forming a part of this specification, and in i which,

Fig. 1 is a view of the front or adjusting side ofmy invention, with the members in `position of rest; p w Fig. 2 is a back view, with the back cover removed, the slidable members being shown in the position of rest and bers broken open; l

Fig. 3 is anenlarge'd view of the lower one of lsaid mem- Fig.\4 is a sectional viewon line 4-4 of Fig. l; f p

ig. 5 is a sectional view on line 5-5 of Fig. 1;

ig. 6 is a partialv front view, with the slidable members moved into operative positions as shown; and

Fig. 7 is a rear View, showing the result obtained byy moving the members into the position shown in Fig. 6. i

The invention illustrated comprises a housing 10, in the front of which is mounted a face or front board 11 provided with slots 12 and, 13 and a rectangular opening 14 over the upper portion of which is mounted a plate 15. At the side ofthe opening 14, several rows of numbered perforations 16 are provided in whichv a stop 17 is mountable. A numbered scale 418 is placed at one side of the slot 13. Knobs 2O and 21 are i carried on the front ends of stems 22 and 23, respectively, which extend through the slots member, engaging beneath the stop `serted in the perforations 33 in the plate 30 index nger 26 which passes over the `scale 18. The bar 25 slides between the side member of the housing anda longitudinally extending rib 277 and the bar 24 slides between `similar ribs 28 and 29 fastened to the front member 11 of the housing. Aphollow member, composed of a front plate 30 and a rear plate 31 suitably connected at their ends, is

slidably mounted in the casing, between the rib 29 `anda similar rib 32. Rows of num-` bered perforations 33 are providedfin the front member 30, arranged in the manner vA seriesof consecutive numbers are provided on the rear face of the bar 24, as indicatedin Fig. 3. The plate 31 is similarlyfprovided with a series of numbers on its rear face; fore referred toare consecutively arranged above and below .a zero line, the `numbers on one'side being provided withthe minus sign f and the numbers on the other side with the plus sign. The bar 25 is connected with a simi-lar bar' 35 by means of cables 36 and 37 35, arranged as showny in Fig. 2. An arm 40 is fastened on the lower Aend of the bar 24, as at 41, and extends laterally through the hollow member, being provided witha part 42 which eXtends'be-yond said hollov7 member and is adapted to yengage beneath the stop 17 inserted in the perforation 16 to limit the upwardmovement of thebar 24. Another arm 43 is fastened on the bar 24 near its middle portion, and extends into' said hollow (see Fig. 2), to carry said hollow member upwards along with the bar 24. A cover 44 is mounted on the back of the'housing (see Figs. 5 and 7), and a window plate 45, provided with a window 46, 'is set into said cover. Stop blocks 47 and 48 are provided to limit the Vdownward `and upward movement respectively, of the hollow member, and a stop block 49 is mounted adjacent the block 48, adapted to limit the upward movement of the bar 24.

Normally the members are at rest in their lowermost position, as shown in Figs. 1 to 5 inclusive, and when 4it is desired to use the device to calculate the transpositionA of lenses, in fitting spectacles the knob 21 with The sets of numbers hereto- I yshown in Figs. 1 and yinwhich ya stop 34 is f insertable.

passing over pulleys 38 and 39, respectively. f

its index linger 26 is raised to the desired position on the scale 18, setting it on 45,

vperforations .33, it carries member, composed of plates 30 and 3l,-until ythe eXtensionAQ oi: arm 4:0 engages beneath .membilS adapted for example, as shown in Fig. 6, to indicate the axis. Said knob 2l. raises the attached bar 25 (see Fig. 5), and through the cables 36 and 3T moves the bar on the opposite side downwards (see F ig. i2), bringing the proper number oi2 said bar 35 under the window 46. in the present case number 135, which indicates the transposed axis. The stop lT is next set in proper position in the numbered pertorations l, to indicate the cylinder', which in the present case is 3.5, and the stop 3er. is set in the proper position in the numbered perforations 33, to indicate the sphere, which `in the present case is +1.25, asshown inFig.; 6. The knob Q0 is then moved upwards in the slot l2, carrying with it the attached bar 24 and its arms 40 and 43 (see Figs. 2 and When the arm 43 reaches the stop 34 inserted in. one of the .with it the hollow stop li', which limits thevupward travel oit said bar 24 Iand saidhollow member. By this manipulation, the numbers on the back of each of said members are y brought in alignment with the proper number on the back of the member 35, the thrceuequired numbers being readable through the window .46 `on the baekof the4 device, giving the vrequired transposed sphere, cylinder, and axis, which in the present case is 225+350, and 135 respectively, as showninFig. 7,. and as is well .understood by those skilled inthis art.

`While have illustrated and described the .preferred form of construction for carrying my` invention into. effect, this is capable .of variation and modification without departing fromfthe spirit oit `the invention. l., therefore, do not wish ,to be limited to the precise details ol the construction set forth, but desire to avail myself of such variations andmodiications as come within the scope of the .appended claims.

`Having described my invention, what vI claim as newand desire to secure byLetters Patent, is

l.. A computing device oit the class described, comprising al housing providedwith anopening in` its vfront wall 5. slidable means mountedin saidhousing, including a member mounted. beneath saidopening andhaw ing means adj nstably attached thereto ;,V numbersfon the rear faces ot said members; meansextending,from one of said slidable to engage said adjustable means .and raise theslidable member attached thereto; and means displaying the Aresult from .said rear numbers.

2. A computing ,device of .the class de scribed,` comprisin av housing provided `with l groups of numbers onits .front face; .slid- `able members.mounted in. saidjhonsing. each of said, slidable ,members being provided, with a row of .numbers on its rear face;

wallg columns et .-.in said housingf means to set said members in position with regard to said Viront numbers, including a part ot one ot' said members engaging means adjustable on said housing to limit the move ment o'iE said member; and means disV laying the result obtained by said rear num ers by the setting olE said members.

j. computing device ot the class described, comprising a housing `provided with groups oi numbers on its 'trout tace; slid able members mounted in said housing, each ot said members being provided with a 'row ot numbers on its rear iacc;A means to set said members in position in accordance with said front numbers, including an arm `on one ot said members to engage'means on another member and move said members in unison; and a window to display the resultant number `of each rea-r row. obtained by the settingol said members.

4.. A computing device oit the class described, comprising a housing provided with groups oi nun'ibers on itsfront face; slid ablemembers mounted in said housing, each o` said members being provided with a -row ot numbers on its rear faceymcans, including stems extending to the lirontV face of said housing, to set said members; and means displaying the result obtained by such setting.

5. A. computing deviceol the class described, comprising a housing provided with an opening in its front wall; slidablemembers mounted in said housing, includinga member mounted beneath said opening and having numbered `peritorations in its front numbers on the rear faces oi"v said members; a stop adapted to be inserted in'either of said pei-iterations; an arm on one of said slida-ble members, adapted to engage said stop to raise saidliper'iiorated member; and means to operate said members.

6. computing device comprising a housing; slidable members mounted therein, which bear operating stems extending to the front wall4 oil. said housing; lairow of num -bers on the rear :face of oneo'l." said. members: 1u the additional slidable members mounted housing and bearing'mlmbers on the `rear "faces,l an arm on one of said members bers mounted in said housing, including a h member mounted beneath said opening and having means adjustably attached thereto; numbers'on the -rear face of said slidable members;means extending from one of said slidable members, adapted to engage said adjustable means and raisethe member attached thereto,- means adjustably positioned.

g, means onv one of said slidable members to engage said adjustable means on the housing and limit the movement of said. slidable members; and `a Window to display the result obtained byysaid rear members.

8. A computing device of the class described, comprising a housing provided With an opening in its front Wall; slidable members mounted in said housing, including a member mounted beneath said opening and having numbered perforations in its front y Wall; columns of numbers provided on the front tace of said housing; columns of numbers on the rear face of said slidable members; a stop adapted to be inserted in either of' said perforations.; an arm on one of said NATHAN PURvIANoE.

Witnesses:

J. H. BETHEL, Mrs. R. L. MARSHALL. 

